Summer Patchwork Cobbler | Cooking Professionally

Ingredients

• ***For the crust:***
• 2 cups all-purpose flour, plus more, to taste, for dusting
• 3 tablespoons granulated sugar
• 1/4 teaspoon table salt
• 1 cup cold butter, cut into pieces
• 1 large egg yolk
• 3 tablespoons milk, ice cold
• ***For the filling:***
• 8 cups firm peaches, peeled and sliced
• 6 cups red plums, sliced
• 2 cups fresh blueberries
• 2 teaspoons vanilla extract
• 1 3/4 cups granulated sugar
• 1/2 cup all-purpose flour, plus more, to taste, for dusting a work surface and a rolling pin
• 1/4 cup butter, melted
• 1 large egg
• 2 tablespoons water
• sanding sugar or sparkling sugar, optional, to taste, for topping